HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes HP-UX 11i v3 September 2013 Web Release (B.11.31) HP Part Number: 5900-3304 Published: September 2013 Edition: 1.
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Contents Logical Volume Manager and MirrorDisk/UX Release Notes...............................5 1 About this document..............................................................................................................5 2 LVM and MirrorDisk/UX overview............................................................................................5 2.1 Overview of changes......................................................................................................
Logical Volume Manager and MirrorDisk/UX Release Notes 1 About this document This document provides information about the Logical Volume Manager (LVM) and the MirrorDisk/UX products for the September 2013 Web release of HP-UX 11i v3. 2 LVM and MirrorDisk/UX overview The Logical Volume Manager (bundle BaseLVM) is the HP-UX default Volume Manager. It provides user with flexibility in configuring and managing mass storage resources.
3 Fixed issues in this version Table 1 (page 6) lists the LVM and MirrorDisk/UX defects fixed in the September 2013 web release of HP-UX 11i v3. Table 1 LVM Fixes in HP-UX 11i v3 September 2013 release Defect ID QXCR1001256843 Description Write I/Os to space-efficient snapshots (write-enabled) at or above 4TB offset always fail. Though no I/O errors occur with fully-provisioned snapshots, unsharing of extents does not happen at or above 4TB offset. Applicable to VG version 2.2.
Table 1 LVM Fixes in HP-UX 11i v3 September 2013 release (continued) Defect ID QXCR1001270167 Description Unsharing of extents in snapshots does not happen when I/Os are issued to its original LV (base LV) at particular offsets (2TB to 4TB, 6TB to 8TB, and so on). Applicable to VG version 2.2.
4.2 Limitations This section provides a list of limitations as known to HP at time of publication. • Logical volumes that have snapshots associated with them might experience an increase in latencies associated with writes. This is also applicable for writes on (writable) snapshots themselves.
5.3.1 LVM boot disks of size greater than 2TB (terabytes) There are specific software (patches) prerequisites for using LVM boot disks of size greater than 2TB. For information about these patches, see the LVM System Administration Guide at http:// www.hp.com/go/hpux-LVM-VxVM-docs. 5.3.2 Mass Storage Critical Resource Analysis The Mass Storage Critical Resource Analysis (MS CRA) tool checks for a maximum of two mirror copies of a logical volume. However, Version 2.
5.4 Required disk space Because LVM is installed with the HP-UX 11i v3 operating environment, it consumes no additional disk space. MirrorDisk/UX consumes no additional disk space aside from a license key. 5.5 Other requirements 5.5.1 HP Insight Remote Support Software HP strongly recommends that you install HP Insight Remote Support software to complete the installation or upgrade of your product and to enable enhanced delivery of your HP Warranty, HP Care Pack Service or HP contractual support agreement.
of size greater than 2 TB, see the LVM System Administration Guide at http://www.hp.com/go/ hpux-LVM-VxVM-docs. 6.3 Moving from HP-UX 11i v2 to HP-UX 11i v3 If you are migrating a system from HP-UX 11i v2 to HP-UX 11i v3, see the LVM migration white paper described in “Related documentation”. It contains information on migrating an LVM configuration from the legacy naming model to the agile naming model.
• Striped Mirrors: Releases prior to HP-UX 11i v3 only support extent-based striping via the -D option to lvcreate. If a logical volume using simultaneous mirroring and non-extent-based striping is created on HP-UX 11i v3, attempts to import or activate its associated volume group will fail on a previous HP-UX release. To import the volume group, you must remove the incompatible logical volumes or reduce them to a single mirror.
• LVM Limits • LVM Migration from Legacy to Agile Naming Model: HP-UX 11i v3 • LVM Online Disk Replacement (LVM OLR) • Using the vgmodify command to Perform LVM Volume Group Dynamic LUN Expansion (DLE) and Contraction (DLC) • LVM Volume Group Quiesce/Resume • SLVM Single-Node Online Reconfiguration (SLVM SNOR) • SLVM Online Reconfiguration • When Good Disks Go Bad: Dealing with Disk Failures under LVM • Using the vgversion Command to Perform LVM Volume Group Version Migration • Using LVM
